hi class can you show me how to prove that AnB=BnA ... im trying to do it but i don't understurd

Question

anonymous · Answer

Is this Commutative multiplication or what?

anonymous · Answer

What are A,n and B?  Numbers?

anonymous · Answer

an n which is between A AND B is the intersection

anonymous · Answer

Ah, sets...

anonymous · Answer

A  and B are sets of numbers while n is representing intersection

anonymous · Answer

Sorry, used to the upside down U

anonymous · Answer

So u want to show that if the two circles change places, the intersection stays the same, is that right?

anonymous · Answer

yes that it

anonymous · Answer

I have to say this strikes me as being rather obvious, I guess that is not what u want though.

Assume there is a set C, subset of A and subset of B, containing all the elements common to A and to B then 

A n B = C  and B n C = C

Is that any good?

anonymous · Answer

ok i never got it at first .the meaning of the intersection .but what you have said i can relate the with the once on the book now .thanks

anonymous · Answer

ur welcome.

anonymous · Answer

let x b contained in A or B (BY DEFINATION OF UNIONS)
this means is equivalent  BuA  (BY COMMUTATIVE LAW)